...
This class definition does not violate CON01CON02-J. Ensure that compound operations on shared variables are atomic, which only applies to classes that promise thread-safety. However, this class has a mutable static counter field that is modified by the publicly accessible incrementCounter() method. Consequently, this class cannot be used securely by trusted client code, if untrusted code can purposely fail to externally synchronize access to the field.
...